<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 头部的警告区域 -->
            <el-alert :closable="false" title="注意：只允许为第三级分类设置相关参数！" type="warning" show-icon></el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
                        v-model="selectedCateKeys"
                        :options="CateList"
                        :props="{ expandTrigger: 'hover',
                        value: 'cat_id',
                        label: 'cat_name',
                        children: 'children' }"
                        @change="handleCateSelectedChange"></el-cascader>
                </el-col>
            </el-row>

            <!-- tab页签区域 -->
            <el-tabs v-model="activeTabsName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button size="mini" type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTabData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                          <template slot-scope="scope">
                            <!-- 循环渲染ta标签 -->
                            <el-tag closable v-for="(item, i) in scope.row.attr_vals " :key="i" @close="(handleTagClose(i, scope.row))">
                              {{item}}
                            </el-tag>
                            <!-- 输入的文本框 -->
                            <el-input
                              class="input-new-tag"
                              v-if="scope.row.tagInputVisible"
                              v-model="scope.row.tagInputValue"
                              ref="saveTagInput"
                              size="small"
                              @keyup.enter.native="handleInputConfirm(scope.row)"
                              @blur="handleInputConfirm(scope.row)"
                            >
                            <!-- 添加的按钮 -->
                            </el-input>
                            <el-button v-else class="button-new-tag" size="small" @click="showTagInput(scope.row)">+ New Tag</el-button>

                          </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column
                        label="参数名称" prop="attr_name"></el-table-column>
                        <!-- 操作 -->
                        <el-table-column
                        label="操作" prop="attr_name">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>

                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加静态属性的面板 -->
                    <el-button size="mini" type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTabData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                          <template slot-scope="scope">
                            <!-- 循环渲染ta标签 -->
                            <el-tag closable v-for="(item, i) in scope.row.attr_vals " :key="i" @close="(handleTagClose(i, scope.row))">
                              {{item}}
                            </el-tag>
                            <!-- 输入的文本框 -->
                            <el-input
                              class="input-new-tag"
                              v-if="scope.row.tagInputVisible"
                              v-model="scope.row.tagInputValue"
                              ref="saveTagInput"
                              size="small"
                              @keyup.enter.native="handleInputConfirm(scope.row)"
                              @blur="handleInputConfirm(scope.row)"
                            >
                            <!-- 添加的按钮 -->
                            </el-input>
                            <el-button v-else class="button-new-tag" size="small" @click="showTagInput(scope.row)">+ New Tag</el-button>

                          </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column
                        label="属性名称" prop="attr_name"></el-table-column>
                        <!-- 操作 -->
                        <el-table-column
                        label="操作" prop="attr_name">
                            <template slot-scope="
                            scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini"
                                @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini"
                                @click="removeParams(scope.row.attr_id)">删除</el-button>

                            </template>
                        </el-table-column>
                    </el-table>

                </el-tab-pane>
            </el-tabs>

        </el-card>

        <!-- 添加参数对话框 -->
        <el-dialog
        @close="addDialogClosed"
        :title="'添加' + tittleText"
        :visible.sync="addDialogVisible"
        width="50%">
            <!-- 对话框内表单 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="tittleText" prop="attr_name">
                <el-input v-model="addForm.attr_name" @keyup.enter.native="addParams"></el-input>
            </el-form-item>
            </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
        </el-dialog>

        <!-- 编辑按钮对话框 -->
        <el-dialog
        @close="editDialogClosed"
        :title="'添加' + tittleText"
        :visible.sync="editDialogVisible"
        width="50%">
            <!-- 对话框内表单 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="tittleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name" @keyup.enter.native="editParams"></el-input>
                </el-form-item>
            </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
        </el-dialog>

    </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      CateList: [],
      // 级联选择框双向绑定的数组
      selectedCateKeys: [],
      //   被激活的页签名称
      activeTabsName: 'many',
      // 动态参数获取到的数据
      manyTabData: [],
      //   静态参数获取到的数据
      onlyTabData: [],
      //   控制添加对话框的显隐
      addDialogVisible: false,
      //   控制编辑按钮对话框的显隐
      editDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      //   编辑按钮对话框的表单数据对象
      editForm: {
        attr_name: ''
      },
      //   添加表单的验证规则
      addFormRules: {
        attr_name: [{
          required: true, message: '请输入参数名称', trigger: 'blur'
        }]
      },
      //   编辑按钮对话框的数据规则对象
      editFormRules: {
        attr_name: [{
          required: true, message: '请输入参数名称', trigger: 'blur'
        }]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //   获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类参数失败！')
      this.CateList = res.data
    },
    // 级联选择框中选项变化，会触发这个函数
    handleCateSelectedChange() {
      this.getParamsData()
    },
    // 获取已选商品的参数数据
    async getParamsData() {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTabData = []
        this.onlyTabData = []
      } else {
        // 获取对应参数
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: this.activeTabsName
          }
        })
        if (res.meta.status !== 200) return this.$message.error('获取参数列表失败!')
        // 分割表格内子参数字符串转换为数组
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 控制标签输入框显隐
          item.tagInputVisible = false
          item.tagInputValue = ''
        })

        this.activeTabsName === 'many' ? this.manyTabData = res.data : this.onlyTabData = res.data
      }
    },
    // tab 页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeTabsName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败！')
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击编辑按钮展示修改对话框
    async showEditDialog(attrId) {
      this.editDialogVisible = true
      //   查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
        params: {
          attr_sel: this.activeTabsName
        }
      })
      if (res.meta.status !== 200) return this.$message.error('获取参数信息失败！')
      this.editForm = res.data
    },
    // 监听编辑按钮的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击编辑按钮 确定 提交
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeTabsName
        })
        if (res.meta.status !== 200) return this.$message.error('修改参数失败！')
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 点击删除按钮根据Id删除数据
    async removeParams(attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') return this.$message.error('删除数据操作取消！')
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) return this.$message.error('删除参数失败！')
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 标签输入框提交事件 离焦 回车
    handleInputConfirm(row) {
      if (row.tagInputValue.trim().length === 0) {
        row.tagInputValue = ''
        row.tagInputVisible = false
      } else {
        // 如果没有return，则证明输入的内容，需要做后续处理
        row.attr_vals.push(row.tagInputValue.trim())
        row.tagInputValue = ''
        row.tagInputVisible = false
        this.saveAttrVals(row)
      }
    },
    async saveAttrVals(row) {
      // 需要把这次操作的数据保存到数据库中
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('修改参数失败！')
      this.$message.success('修改参数成功！')
    },
    // 标签按钮点击变输入框
    showTagInput(row) {
      row.tagInputVisible = true
      // 让文本框自动获取焦点
      // $nextTick 方法的作用，就是当页面上元素重新渲染之后，才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 触摸标签x号删除标签
    handleTagClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    //   如果按钮需要被禁用返回true 否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) return true
      return false
    },
    // 当前选中三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) return this.selectedCateKeys[2]
      return null
    },
    // 动态计算标题的文本
    tittleText() {
      if (this.activeTabsName === 'many') return '动态参数'
      return '静态属性'
    }

  }
}
</script>

<style lang="less" scoped>
.cat_opt {
    margin: 15px 0;
}
.el-tag {
  margin:10px
}
  .input-new-tag {
    width: 120px;
    vertical-align: center;
  }
</style>
